Results from phase 1 of the HAYSTAC microwave cavity axion experiment
By L. Zhong, S. Al Kenany, K. Backes, B. Brubaker, S. Cahn, G. Carosi, Y. Gurevich, W. Kindel, S. Lamoreaux, Konrad W. Lehnert and 11 more. 2018
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We report on the results from a search for dark matter axions with the HAYSTAC experiment using a microwave cavity detector at frequencies between 5.6-5.8$\, \rm Ghz$. We exclude axion models with two photon coupling $g_{a\gamma\gamma}\,\gtrsim\,2\times10^{-14}\,\rm GeV^{-1}$, a factor of 2.7 above the benchmark KSVZ model over the mass range 23.15$\,<\,$$m_a \,$<$\,$24.0$\,\mu\rm eV$. This doubles the range reported in our previous paper. We achieve a near-quantum-limited sensitivity by operating at a temperature $T<h\nu/2k_B$ and incorporating a Josephson parametric amplifier (JPA), with improvements in the cooling of the cavity further reducing the experiment's system noise temperature to only twice the Standard Quantum Limit at its operational frequency, an order of magnitude better than any other dark matter microwave cavity experiment to date. This result concludes the first phase of the HAYSTAC program utilizing a conventional copper cavity and a single JPA.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/40f5b360d514856bfec478d0683eeeae959eed6a
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Citations in the corpus
- Detecting high-frequency gravitational waves with microwave cavities (2021, methodology): “Motivated by the tremendous progress in small-scale technology targeting dark matter detection, we focus on setups that are either identical or similar to existing experiments (such as ADMX [46], HAYSTAC [47], ORGAN [48], and CAPP [49]), which feature a resonant conducting cavity of size Ldet ∼ O(cm”